fix scalastyle

Author: Jacky Li

mllib/src/main/scala/org/apache/spark/mllib/fpm/FPGrowth.scala

@@ -29,11 +29,11 @@ import org.apache.spark.rdd.RDD
  * This class implements Parallel FP-growth algorithm to do frequent pattern matching on input data.
  * Parallel FPGrowth (PFP) partitions computation in such a way that each machine executes an
  * independent group of mining tasks. More detail of this algorithm can be found at
- * [[http://dx.doi.org/10.1145/1454008.1454027, PFP]], and the original FP-growth paper can be found at
- * [[http://dx.doi.org/10.1145/335191.335372, FP-growth]]
+ * [[http://dx.doi.org/10.1145/1454008.1454027, PFP]], and the original FP-growth paper can be
+ * found at [[http://dx.doi.org/10.1145/335191.335372, FP-growth]]
  *
- * @param minSupport the minimal support level of the frequent pattern, any pattern appears more than
- *                   (minSupport * size-of-the-dataset) times will be output
+ * @param minSupport the minimal support level of the frequent pattern, any pattern appears
+ *                   more than (minSupport * size-of-the-dataset) times will be output
  */
 class FPGrowth private(private var minSupport: Double) extends Logging with Serializable {
 

mllib/src/main/scala/org/apache/spark/mllib/fpm/FPTree.scala

@@ -64,7 +64,8 @@ class FPTree extends Serializable {
    * @return root node after merge
    */
   private def mergeTree(tree1: FPTreeNode, tree2: FPTreeNode): FPTreeNode = {
-    // firstly merge two roots, then iterate on the second tree, merge all children of it to the first tree
+    // firstly merge two roots, then iterate on the second tree, merge all
+    // children of it to the first tree
     require(tree1 != null)
     require(tree2 != null)
     if (!tree2.isRoot) {
@@ -108,7 +109,8 @@ class FPTree extends Serializable {
   }
 
   /**
-   * This function will walk through the tree and build all conditional pattern base out of it
+   * This function will walk through the tree and build all conditional pattern
+   * base out of it
    * @param tree the tree to expand
    * @return conditional pattern base
    */
@@ -187,7 +189,8 @@ class FPTree extends Serializable {
             val lineCom = v.toList.combinations(k)
             lineComListBuffer ++= lineCom.toList
           } else {
-            /* if each value length > k,it need calculate the intersect of each value & before combinations */
+            // if each value length > k,it need calculate the intersect of each
+            // value & before combinations 
             val union_lineComListTemp2v = v intersect lineComListTempBuffer.toArray.array
             // calculate each value combinations after intersect
             if (union_lineComListTemp2v.length >= k) {